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trifling, and its utility being fully proved, it is very extra- 

 ordinary that it is so little in use. It is hoped, however, that 

 the attention of persons connected with mines will be called 

 to the subject by the publication of this valuable communica- 

 tion. 



" On the Causes of the different Rates of MortaUty in some of 

 the most populous Towns in the West Riding of York- 

 shire," by the Rev. W. Thorp. 



Sheffield and Leeds have exactly the same rates of mortality, 

 1 in every 38 persons dying annually in each place. Why is 

 this? Huddersfield and Halifax have likewise exactly the 

 same rates of mortality, 1 in every 48 persons dying. Why 

 are these rates exactly alike ? And why are the two latter 

 places so much more healthy than Leeds or Sheffield, or even 

 than the agricultural districts of Doncaster, Thome, Selby, 

 Pontefract, and Goole ? Barnsley and Wakefield have like- 

 wise the same rates of mortality. Bradford is much more 

 healthy than Leeds or Sheffield. Why is this ? The districts 

 of Glendale, Bellingham, and Haltwhistle, about 15 miles 

 distant from Newcastle, are just twice as healthy as New- 

 castle itself, 1 in 68 dying in these districts, and 1 in 34 in 

 Newcastle. Liverpool, with its gentle slope to the Mersey 

 and fine sea air, is the most unhealthy town in England; 

 while the oolite districts of Helmsley, Pickering, and Malton, 

 are the most salubrious parts in Yorkshire. The Paper 

 professes to account for these differences. 



" On Vibrations producing Sound," by W. Sykes Ward, Esq. 



This Paper treats of one of the most profound branches 

 of the physical sciences, and discusses the question whether 

 sound is produced and propagated by undulatory or by pro- 

 gressive motion. 



On the Mutual Relations of Animal and Vegetable Existence," 

 by Dr. Heaton. 



B B 



